[英]How to make MYSQL query results ORDER BY conditions order?
我的查詢字符串如下:
SELECT ... FROM maintable
LEFT JOIN table1 on (maintable.id = table1.idx)
LEFT JOIN table2 on (table1.idy = table2.idy)
LEFT JOIN table3 on (table2.idz = table3.idz)
WHERE (condition1 OR condition2 OR condition3)
AND maintable.status = static
//condition1 & condition2 & condition3 are kind of
table3.idz = 101, table3.idz = 3, maintable.id IN (1,2,3,4), and so on
對於結果,我想,以滿足項目condition1
首先被退回,則符合項condition2
,最后符合項condition3
。 有任何想法嗎?
要按所需順序進行排序,請在ORDER BY中使用條件,但在它們之后使用DESC
。
SELECT *
FROM person
WHERE (condition1 OR condition2 OR condition3)
AND maintable.status = static
ORDER BY
condition1 DESC,
condition2 DESC,
condition3 DESC
如果這不起作用,因為您的查詢更復雜,那么您可以使用布爾邏輯將您的查詢(A OR B OR C) AND D
更改為(A AND D) OR (B AND D) OR (C AND D)
那么你可以使用以下查詢:
SELECT *
FROM person
WHERE (condition1 OR condition2 OR condition3)
AND maintable.status = static
ORDER BY
condition1 AND static DESC,
condition2 AND static DESC,
condition3 AND static DESC
這里不需要AND static
,因為所有行都返回它,但是在一個更復雜的例子中(你也返回一些非靜態的行),你必須以這種方式去做。
這應該工作:
ORDER BY condition1, condition2, condition3
例如
ORDER BY (weight > 500), (height > 3), (height < 2)
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